It can be anything! An apex, subdomain, or even a URL.

Results forinternalsite.matsyahavelock.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-11-03T10:15:57.292	2021-11-03T09:15:57	2022-02-01T09:15:56	internalsite.matsyahavelock.com	internalsite.matsyahavelock.com	C=US, O=Let's Encrypt, CN=R3
2021-11-03T10:15:57.164	2021-11-03T09:15:57	2022-02-01T09:15:56	internalsite.matsyahavelock.com	internalsite.matsyahavelock.com	C=US, O=Let's Encrypt, CN=R3
2021-09-04T14:09:08.752	2021-09-04T13:09:07	2021-12-03T13:09:06	internalsite.matsyahavelock.com	internalsite.matsyahavelock.com	C=US, O=Let's Encrypt, CN=R3
2021-09-04T14:09:07.761	2021-09-04T13:09:07	2021-12-03T13:09:06	internalsite.matsyahavelock.com	internalsite.matsyahavelock.com	C=US, O=Let's Encrypt, CN=R3